uneven x_vals

[aloctavodia]

Compute xvals, using a mix of linearspaced and "quantile-spaced" values. This provides nicer plot smoother plots at the bulk and tails for both heavy and thin tails distributions. This also change hdi_from_pdf in order to return nan when computations of the hdi fails (for instance for invalid parameter values like sigma=0).

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.71429% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 81.12%. Comparing base (6124c61) to head (31a80e1).

Files	Patch %	Lines
preliz/distributions/distributions.py	90.90%	1 Missing ⚠️
preliz/internal/distribution_helper.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #424      +/-   ##
==========================================
- Coverage   81.14%   81.12%   -0.03%     
==========================================
  Files          92       92              
  Lines        7490     7501      +11     
==========================================
+ Hits         6078     6085       +7     
- Misses       1412     1416       +4     

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